This is a very general question. There are many types of data storage devices, but the most common storage device that holds data instructions and information we think about today in the modern personal computer is the Hard Disk Device (HDD).
The HDD is an example of a magnetic storage media. Other example are tape drives, and floppy disks. Other types of storage are Optical (CD's and DVD's) and solid state devices like flash drives.
Secondary Storage
usb drive
Folders on a storage device can hold documents and applications.Folders on a storage device can hold documents and applications.Folders on a storage device can hold documents and applications.Folders on a storage device can hold documents and applications.Folders on a storage device can hold documents and applications.Folders on a storage device can hold documents and applications.Folders on a storage device can hold documents and applications.Folders on a storage device can hold documents and applications.Folders on a storage device can hold documents and applications.Folders on a storage device can hold documents and applications.Folders on a storage device can hold documents and applications.
No, a bar code scanner is not a storage device. The scanner is a peripheral device used to read the bar code on a product, and an associated computer can use that information to identify that product and provide pricing and other information about it. That identifying information and other data is held on a storage device associated with the computer.
A sending device
It would be considered a storage device as you can give or receive information from the device.
Cpu
An input device provides data for your computer to process (eg: keyboard, mouse). An output device displays information (eg: monitor, speakers). A storage device stores information for alter use (eg: hard drive, CD).
the size of the disk storage device
file
yes it is a memory(secondary) that stores info
Yes It retains information even when powered down. vs RAM which is a volatile storage device because the information is lost when it's powered down.